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Faster-than-light - Terminology | | Faster-than-light - Terminology: Encyclopedia II - Faster-than-light - Terminology | | In the context of this article, FTL actually refers to the transmission of information or matter faster than c, a constant equal to the speed of light in a vacuum, roughly 300 million metres per second. This is not quite the same as travelling faster than light, since:
There are some processes which do propagate faster than c, but which can't actually carry information (See the Apparent FTL section in this article).
Light itself will travel at a speed slower than c when not in a vacuum (causing refr ...
See also:Faster-than-light, Faster-than-light - Terminology, Faster-than-light - Possibility of FTL, Faster-than-light - Option A: Ignore special relativity., Faster-than-light - Option B: Get light to go faster., Faster-than-light - Option C: Give up causality., Faster-than-light - Option D: Give up absolute relativity., Faster-than-light - Tachyons, Faster-than-light - General relativity, Faster-than-light - Apparent FTL, Faster-than-light - Moving spot of light, Faster-than-light - Relative motion, Faster-than-light - Phase velocities above c, Faster-than-light - Group velocities above c, Faster-than-light - Universal expansion, Faster-than-light - Astronomical observations, Faster-than-light - Quantum mechanics | | | Faster-than-light, Faster-than-light - Apparent FTL, Faster-than-light - Astronomical observations, Faster-than-light - General relativity, Faster-than-light - Group velocities above c, Faster-than-light - Moving spot of light, Faster-than-light - Option A: Ignore special relativity., Faster-than-light - Option B: Get light to go faster., Faster-than-light - Option C: Give up causality., Faster-than-light - Option D: Give up absolute relativity., Faster-than-light - Phase velocities above c, Faster-than-light - Possibility of FTL, Faster-than-light - Quantum mechanics, Faster-than-light - Relative motion, Faster-than-light - Tachyons, Faster-than-light - Terminology, Faster-than-light - Universal expansion, Category:Faster-than-light travel, Category:Faster-than-light communication | | |
| | | Faster-than-light: Encyclopedia II - Faster-than-light - Terminology
Faster-than-light - Terminology
In the context of this article, FTL actually refers to the transmission of information or matter faster than c, a constant equal to the speed of light in a vacuum, roughly 300 million metres per second. This is not quite the same as travelling faster than light, since:
- There are some processes which do propagate faster than c, but which can't actually carry information (See the Apparent FTL section in this article).
- Light itself will travel at a speed slower than c when not in a vacuum (causing refraction), and in certain materials other particles can travel faster than that speed (but still slower than c), leading to Cherenkov radiation.
Neither of these phenomena violate special relativity or create problems with causality, and thus do not qualify as FTL as described here.
Other related archivesAlcubierre drive, Casimir effect, Casimir vacuum, Category:Faster-than-light communication, Category:Faster-than-light travel, Cherenkov radiation, Earth, Feynman diagram, Galilean relativity, Galilean transformations, General Relativity, General relativity, Giovanni Amelino-Camelia, João Magueijo, Lorentz transformations, Mach's principle, Newton's laws of motion, Novikov self-consistency principle, Planck length, Richard Feynman, Simultaneity, Special Relativity, Theory of Relativity, acceleration, adds velocities, blazars, causality, closed timelike curves, communications, comoving distance, correct calculation, elementary particles, exotic matter, frame of reference, general relativity, gravitons, gravity, group velocity, information, matter, microquasars, optical illusion, particle accelerator, phase velocity, phonograph, photons, quantum entanglement, quantum gravity, quantum mechanics, quantum tunneling, quasars, radio galaxies, refraction, rest mass, science fiction, signals, spacetime, speed of light, superluminal motion, supernova, tachyons, time travel, travel, uncertainty principle, universe, vacuum energy, variable speed of light, velocity, wave, wave velocity, wormhole, wormholes
 Adapted from the Wikipedia article "Terminology", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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